An alternative to getting rid of your desktop items, would be to choose not to show any; right-click the desktop and under "View", uncheck "Show desktop icons". Now nothing will appear on your desktop except Rainmeter items.

To have quick access to desktop items, I add a "Toolbar" to the "Taskbar" that points to my Desktop folder. Right-click the taskbar and select "Toolbars", then "Desktop" or "New toolbar..." and select the Desktop folder.

Then I simply open that list from the taskbar toolbar to see a list of all my desktop items.

It would look like this:

desktoptoolbar.png

This is one way to have a clean desktop but still have quick access to Desktop items.

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[In theory] You could read the proper "ItemPos..." from the first shell bag desktop key, then search that key for the right file. The tricky part will be to modify the "location" (in hex) of the file in that key....and then make sure Windows updates the shell (explorer) with the new information. It might not update unless Explorer.exe is restarted, or possibly a logout/login.

As you can see, it's quite a convoluted set of steps required to do this with a lot of "unknowns". [/Theory]